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The pilot light will light but when you turn it over for the heater to come on it goes off, what is causing this?

Blowing the heater out

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Try replacing the Thermocoupler
Col. Dana Gillespie.

Posted on Dec 04, 2014

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The pilot on our hot water heater randomly goes out for no reason. What could cause this? We've replaced all the parts service guys have suggested and nothing has changed.


pilot lights go out from --not enough pressure or wind drafts than can get to the area blowing them out
check for missing shrouds to protect the flame

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pilot light will shutoff for few diff reason. 1) thermocouple is too weak. needs to be 20-30 dc millivolts to keep pilot on.
2) negative downdraft is blowing pilot out. 3) continuity in gas valve is fluctuation, causing the valve to close and therefor shutoff the pilot

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you either have a back draft blowing out the pilot light, or a bad thermal coupling. if coupling is bad it will shut down the gas flow therefore shutting off pilot light. its a safety measure to stop the gas flow if pilot goes out. replace thermal coupling, that may do it. good-day ! but shut off gas first !

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1 Answer

Pilot keeps blowing out


If the pilot turns off after 30 minutes this could be the result of using butane. On cold days it freezes, best to use propane for all year use. if it goes out after a minute this is most likely a worn thermocouple, for info found this site very useful, patio heater problem solving.

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I have a rheem fury model 21v30s and the pilot will light and heat the water but once the burner plate goes out the pilot goes out as well. How do I fix this issue without replacing the water heater? I...


Open a nearby window to let in plenty of air and see if problem continues.
Problem might be something simple like vent backflow blowing out pilot, or more complicated like bad gas control, or combination of problems listed below.
Suspects include:
Faulty gas control thermostat.
Air in gas line.
Low gas pressure.
Hot attic air.
Insufficient air, or dirty air intake.
Dirty combustion parts, and tubes.
Thermocouple not sitting in flame.
Thermocouple tightened too much. Finger tight + 1/4 turn. No joint compound or teflon tape.
Bad venting.
Backflow of air down vent pipe caused by tight house and/or other vent fans in house.

Open following link for resources, illustrations and reading:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean
http://waterheatertimer.org/pdf/Bosch_Checking_the_draft.pdf
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf

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1 Answer

The pilot light goes out. When I go to re-light the pilot and turn the temp for vacation to medium the flame goes out again.


The pilot light jet may have got a little bit of dirt or grit in it which is preventing it from keeping alight. Try probing the jet with a fine piece of wire to see it the blockage can be dislodged. You may have to unscrew the jet to clear it by blowing air through it. Make sure gas is turned off first before removing any parts.

The pilot light also has a thermocouple that allows gas to the pilot light while the flame is burning. If flame goes out it shuts gas off to the pilot jet. The thermocouple is bypassed by a switch during the initial ignition and once the thermocouple warms up after a minute or two of holding in the bypass switch, it should maintain the pilot. If, after cleaning, the pilot light keeps going out, it would seem that your thermocouple is faulty and needs to be replaced

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You need to replace the pilot light. This is an easy replacement, it goes from your gas control valve to its place in the heater. You can try "taping" the dust out or pulling it out and blowing it clear. This will fix your pilot light problem.

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1 Answer

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turn the gas on real slow. The air in the line is blowing out the pilot

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